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Dedicated to Professor Hirosi Nagao on his sixtieth birthday
This research was partly supported by Grant-in-aid for Scientific Research, The Ministry of Education, Science and Culture
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Kawanaka, N. Generalized Gelfand-Graev representations of exceptional simple algebraic groups over a finite field I. Invent Math 84, 575–616 (1986). https://doi.org/10.1007/BF01388748
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DOI: https://doi.org/10.1007/BF01388748